Malicious PDF — malware analysis report

Static analysis result for SHA-256 834929e58a9c6524…

MALICIOUS

PDF

84.9 KB Created: 2021-06-29 17:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bd8f1a04fddc86257e073afaa00e3a64 SHA-1: f1fa5dbf4ab29bdee98430cc4d224951929e527d SHA-256: 834929e58a9c65244e610c92677ddd09bbba409d9fe7907e250d44a5b105670c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised CMS platforms, suggesting a link farm or SEO poisoning attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=area+of+a+circle+explained PDF link annotation
    • https://meesens.be/KrMee/Tekstverwerker/lofefojeparuwosu.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/92db0a2b471c7153d380ddc5da088499/junekewefidudugebemo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/89d84409a8e8c8a4899539bb684f24f1/faxumojewefib.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/mibezebelovonel.pdfIn PDF document text
    • http://rld-carbon.ru/file/81456928404.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080e91135678---bebisadu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61f0c09143---65515022604.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a96763a3208e682f93e8d268472fd80c/21362546727.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/zitujodateponoganubit.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/eequhl5to3loaqklf9371f5eo5/23989754058.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d93fac57b---petudove.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f151e0d08---xepamotezilokajazozu.pdfIn PDF document text
    • https://plasy.com/uploads/file/99956210484.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/219227be006d50906f75a854b6cff9f6/44653815871.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/55874845552.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/xofumodamogaxi.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/kixegirozevufijataje.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95352e999e60086a7d9e8e1aeff0d461/20614245283.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 16960 bytes
SHA-256: 998408684a6874fe0537d2af35402bbd4ed0c393f52423c8a913ae765dc6d61a
font_01_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 10428 bytes
SHA-256: 26abf7e94b4ec05a8625874c56b5d437663abbb150c654a1cdae4a5f7cd77f23
font_02_sfnt_off00012ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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